Wood-burning furnace.



No. 665,440. Patented m. a, 1901. i

E. H. HUENEFELD. WOUWBURNING FURNACE.

(Applicption filed 3dr. 5, 1898.)

(No Model.) 2 Sheets-Sheet l.

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woop aunnme rummcs.

(Application filed am. a. 1898.: (No Model.)

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WITNESSES INVENTOR i STATES ERNST H. HUENEFELD, OF CINCINNATI, OHIO.

WOOD-BURNING FURNACE.

SPECIFICATION formingpart of Letters Patent No. 665,440, dated January8, 1901.

Application filed March 5, 1898. Serial No. 672,679. (No model.)

To all whom it may concern:

Be it known that I, ERNST H. HUENEFELD, of Cincinnati, in the county of"Hamilton and State of Ohio, have invented certain new and usefulImprovements in Wood-Burning Furnaces; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to an improvement in wood-burning furnaces; and itis an improvement on and embodies the main features of the constructiondisclosed in the application of William H. James, filed July 20, 1897,Serial No. 645,254, for an improvement in woodburning stoves.

The James stove is designed for heating a single room or hall, Whereasthe improvement here involved is designed for heating a house orbuilding or a series of rooms therein like the ordinary coal-furnace.

My invention consists in the parts and combinations of parts, as will bemore fully described, and pointed out in the claim.

In the accompanying drawings, Figure 1 is a view in section of a furnaceembodying my invention. Fig. 2 is a view in elevation of the same. Fig.3 is a view in transverse section. Fig. at is a view in plan; and Fig. 5is a bottom plan, the bottom plate being removed.

A represents an outer jacket open or closed at its lower end andrectangular longitudinally and square transversely. The lower end ofthis jacket rests on a floor or foundation, and when resting on woodworkI prefer to have the lower end closed either by a permanent bottom or bya plate as a precautionary measure against overheating the parts. Thisjacket A carries the cylindrical fire-pot B, which latter is preferablysheet metal and is provided with a lining O, which latter may beremovable and is designed to protect the fire-pot proper against injurydue to the careless feeding of heavy logs to the fire.

The fire-pot is closed at its bottom and top, and its top may rest up incontact with the inner face of the top of the jacket, or it may beremoved from the top of the jacket, thus leaving an air-space betweenthe two parts; but in either case the top of the jacket and fire-pot-areeach provided with an opening nets of combustion to the smoke-pipe D.The

fire-pot and jacket are suitably braced at properpoints to brace andmaintain the parts in their relative positions, and they are alsoprovided with a fuel-door E, if desired, in the front face of the stoveand with a door F below the fuel-door E, through which the ashes may beremoved, and which carries a damper for regulating the draft.

Instead of providing the front'of the stove with two doors-one for theintroduction of fuel and a lower smaller door for the removal of ashesand for the draft-I can dispense with one door and feed all the fuelthrough the top of the stove, as previously explained, and provide asingle door for the removal of ashes, or I can make this single doorsufficiently large for the introduction of fuel as well as for theremoval of ashes. The openings through the jacket and fire-pot aresurrounded by suitable collars within the space between the jacket andfire-pot, so as to exclude or prevent the hot air arising between thejacket and fire-pot from entering the fire-pot.

As the jacket is angular transversely and the fire-pot curved with itsgreatest diameter somewhat less than the smaller diameter of the jacket,four comparatively large airspaces are formed at the four corners of thejacket with restricted spaces intermediate the four corners.

In the James stove above referred to the top of the stove is perforatedat the four corners in or adjacent to the top and the heated air as itrises passes out through these perforations into the room.

In the present device I connect hot-air pipes F to the top of the jacketand run these hotair pipes to the several rooms or to several parts ofthe same room. I can attach these pipes (one at each corner of thefurnace) directly to the top of the furnace, or, if desired,

I can provide the top of the furnace with a continuous hot-air belt andconnect a hot-air pipe or any number of pipes directly to this hot-airbelt.

Leading into the jacket is the cold-air pipe G. This pipe preferablyleads from a point outside the house to the furnace and discharges theair directly under the fire-pot.

In order to prevent a reversal of the direction of current of air, Idischarge the cold air onto the inverted cone H. This cone rests againstthe under side of the fire-pot, and hence forms an air-space between thecone and the fire-pot, thus causing the air to be discharged at a pointsomewhat removed from the highly-heated surfaces, and as it rises itbecomes gradually heated and follows the upward current produced by therising of the heated air between the fire-pot and jacket.

In practice it has been found that where the cold-air pipe dischargesinto the space between the jacket and fire-pot in starting the fire theheated air is under some conditions liable to pass out through thecold-air pipe, and this tendency can be overcome by discharging the airat a point somewhat removed from the fire-pot which heats up veryrapidly and under a con which distributes the air evenly around thefire-pot.

A furnace of this character is comparatively inexpensive, as it is madeprincipally of sheet metal, and it can, besides heating the room it isin, also be utilized for heating sev eral other rooms or an entirehouse.

It is evident that many slight changes might be resorted to in therelative arrangement of parts herein shown and described withoutdeparting from the spirit and scope of my invention. Hence I would haveit understood that I do not wish to restrict myself to the exactconstruction herein shown; but,

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a wood-burning furnace, the combination of an outer jacket, an innerfire pot closed at its bottom and located within the jacket, thefire-pot-and jacket being so shaped and placed relatively to each otheras to form a series of enlarged flues within the space between thefire-pot and jacket, and hot-air flues leading from the upper ends ofsaid enlarged fines, the base of the jacket below the closed end of thefire-pot having a cold-air ingress discharging under the closed bottomof the fire-pot, of an inverted cone located under the closed bottom ofthe fire-pot for deflecting the cold air to the several enlarged fines,substantially as set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

ERNST H. HUENEFELD.

Witnesses:

M. OoUeHLIN, P. S. PHILLIPS.

